Subtract 6/9 from 21/45
21/45 - 6/9 is -1/5.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 45 and 9 is 45
Next, find the equivalent fraction of both fractional numbers with denominator 45 - For the 1st fraction, since 45 × 1 = 45,
21/45 = 21 × 1/45 × 1 = 21/45 - Likewise, for the 2nd fraction, since 9 × 5 = 45,
6/9 = 6 × 5/9 × 5 = 30/45 - Subtract the two like fractions:
21/45 - 30/45 = 21 - 30/45 = -9/45 - After reducing the fraction, the answer is -1/5
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/45-6/9 21/45-12/9 21/90-6/9 21/45-6/18 63/45-6/9 21/45-18/9 21/45-6/27 21/45-30/9 21/45-6/45 21/45-42/9 21/45-6/63